package com.lagou.edu.interceptor;

import com.lagou.edu.anotation.Security;
import org.springframework.util.StringUtils;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 自定义springmvc拦截器
 */
public class MyIntercepter01 implements HandlerInterceptor {

    /**
     * 会在handler方法业务逻辑执行之前执行
     * 往往在这里完成权限校验工作
     *
     * @param request
     * @param response
     * @param handler
     * @return 返回值boolean代表是否放行，true代表放行，false代表中止
     * @throws Exception
     */

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("MyIntercepter01 preHandle......");
        HandlerMethod method = (HandlerMethod) handler;
        Security beanAnnotation = method.getBeanType().getAnnotation(Security.class);
        Security methodAnnotation = method.getMethodAnnotation(Security.class);
        if ("handError".equals(((HandlerMethod) handler).getMethod().getName())){
            return true;
        }

            if (null!=beanAnnotation&&beanAnnotation.value().length!=0){
                String[] value = beanAnnotation.value();
                for (String s : value) {
                    if (!StringUtils.isEmpty(s) && s.equals(request.getParameter("username"))) {
                        return true;
                    }
                }
                response.sendRedirect("/demo/handError?username="+request.getParameter("username"));
                return false;
            }


        if (null!=methodAnnotation&&methodAnnotation.value().length!=0){
            String[] value = methodAnnotation.value();
            for (String s : value) {
                if (!StringUtils.isEmpty(s) && s.equals(request.getParameter("username"))) {
                    return true;
                }
            }
            response.sendRedirect("/demo/handError?username="+request.getParameter("username"));
            return false;
        }





        return true;
    }

    /**
     * 会在handler方法业务逻辑执行之后尚未跳转页面时执行
     *
     * @param request
     * @param response
     * @param handler
     * @param modelAndView 封装了视图和数据，此时尚未跳转页面呢，你可以在这里针对返回的数据和视图信息进行修改
     * @throws Exception
     */
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("MyIntercepter01 postHandle......");
    }

    /**
     * 页面已经跳转渲染完毕之后执行
     *
     * @param request
     * @param response
     * @param handler
     * @param ex       可以在这里捕获异常
     * @throws Exception
     */
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("MyIntercepter01 afterCompletion......");
    }
}
